['Size and Weight Limits']
['Sizes and weights']
03/14/2025
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| Dimension | National Network | State and Other Supplemental Highways |
| Width: | 8' 6" | 8' 6" |
| Height: | 14' On turnpike, interstate, or U.S. hwy 14' 6" auto transporters | 14' On state highways - map available 14' 6" auto transporters |
| Length: | National Network | On All Others |
| Bus | 45' | 45' |
| Articulated bus | ||
| Straight Trucks | 45' | 45' |
| Straight truck and trailer | 70' | 70' |
| Tractor-semitrailer combinations | No limit with legal trailer | No limit with legal trailer |
| Semitrailer | 53' | 53' |
| Tractor-twin-trailer combination | No limit with legal trailers | No limit with legal trailers |
| Trailers of twin-trailer combinations | 53' Not to exceed 110' cargo-carrying capacity limits on Interstate and 4-lane divided highways only | 29' |
| Boat-transporter combination | ||
| Overhang limitations | ||
| Stinger-steered boat-transporter | ||
| Overhang limitations | ||
| Auto-transporter | NS | NS |
| Overhang limitations | 3' front, 4' rear | 3' front, 4' rear |
| Stinger-steered auto-transporter | 80' | 80' |
| Overhang limitations | 4' front, 6' rear | 4' front, 6' rear |
| Saddlemount | 97' | 75' |
| General overhang limitations | ||
| Drawbar | ||
| Dromedary | ||
| Kingpin to rearaxle | ||
| Length special limitations or restrictions | All triple-trailer combinations require an annual permit. | |
| Weight: | Interstate and Defense Highways | On All Others |
| Steer axle | ||
| Single axle | 20,000 | 20,000 |
| Tandem axle | 34,000 | 34,000 |
| Tridem axle | ||
| Gross vehicle weight | 80,000 | 80,000 |
| Load per inch width of tire | ||
| Per wheel | ||
| Tolerances | ||
| APU allowance | 400 | 400 |
| Natural gas allowance | 2,000 Includes battery and hydrogen fuel powered - may require federal exemption | 2000 Includes battery and hydrogen fuel powered |
| Weight special limitations or restrictions | ||
Bridge rules
FEDERAL BRIDGE FORMULA: For all highway operations, the maximum weight of any vehicle or combination of vehicles and load may not exceed that which is determined by the following formula:
W - maximum weight in lbs. carried on any group of two or more axles computed to nearest 500 lbs.
L - distance in feet between the extremes of any group of two or more consecutive axles.
N - number of axles in group under consideration.
['Size and Weight Limits']
['Sizes and weights']
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